Join Date: Nov 2010
Drives: 04 sedona,94 suburban,97 sephia Tuned & ported
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first thing i would look at would be the motor mounts, the front one mainly......if that mount is not sagging all that badly, it may actually be your down pipe (flex Pipe), causing the issue.........to test, try removing the 2 ,14 mm bolts attaching the flex pipe to your oil pan, and see if the vibration is better....if it is better a new flex pipe may be in order.